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We measure the mass of the B{sub s}° meson by fully reconstructing the decay B{sub s}° → J/?? with the subsequent decays J/? →??− and? → K+ K−. The data was obtained from 19.3 pb−1 of integrated luminosity of {bar p}p collisions at √s = 1.8 TeV using the Collider Detector at Fermilab (CDF). A sample of 80,000 inclusive J/? →?+?− events is used to study systematic biases in track reconstruction and is used to calibrate the momentum scale. We reconstruct the kinematically similar decays B− → J/? K− and B° → J/? K* to study the mass measurement technique used for the B° meson. Based on the observation of 32 ± 6 candidates, the mass of the B{sub s}° meson is measured to be 5369.9 ± 2.3 ± 1.3 MeV/c2.
This book collects the Proceedings of the Workshop "Incontri di Fisica delle Alte Energie (IFAE) 2006, Pavia, 19-21 Aprile 2006". The workshop is the fifth edition of a series of workshops on fundamental research in particle physics, as carried on at the most important international laboratories, and possible fallouts in medical and technological applications. Researches in this field aim at identifying the most elementary constituents of matter.
The QNP series of international conferences on Quarks and Nuclear Physics is by now a well established and highly respected forum where the most recent developments in the field are discussed and communicated. QNP 2006 is the forth edition of this biennial meeting. Selected and refereed original contributions of QNP 2006 have been published in The European Physical Journal A - Hadrons and Nuclei (EPJ A), while the present proceedings book, in addition to reprinting the articles published in EPJ A, further includes all other contributions selected and accepted by the organizing committee for publication and archiving.
We report on the observation of bottom-charm mesons via the decay mode B[sub c][sup [+-]] [yields] J/[psi]l[sup [+-]][nu] in 1.8 TeV p[anti p] collisions using the CDF detector at the Fermilab Tevatron. A fit of background and signal contributions to the J/[psi]l mass distribution yielded 20.4[sup +6.2][sub -5.5] events from B[sub c] mesons. We measured the B[sub c][sup +] mass to be 6.40[+-]0.39(stat.)[+-]0.13(syst.)GeV/c and the B[sub c][sup +]lifetime to be 0:46[sup +0.18][sub -0.16](stat.)[+-] 0.03(syst.)ps. The measured production cross section times branching ratio for B[sub c][sup +][yields]J/[psi]l[sup +][nu] relative to that for B[sup +][yields]J/[psi]K[sup +] is 0.132[sup +0.041][sub -0.037](stat.)[+-]0.031(syst.)[sup +0.032][sub -0.020](lifetime).